I tested for Nitrates again today and there were around 12.5. I know this isn't too bad, but should I be conserned since yesterday I did a 5 gallon water change on my 55? I vaccumed the DSB a little too. Should I maybe do a larger water change? My nitrites and ammonia are 0. Could this maybe be my DSB is too new or can a BakPak 2r skimmer build up nitrates in the camber? I do not have any bio-media in the chamber. Any info would be helpful.